Aggregate Calculator
Calculate the volume and weight of coarse aggregate needed for a given volume of concrete and mix ratio.
- Free to use
- No registration required
- Works on all devices
- Last updated
- 12-09-2026
Enter your concrete volume and mix ratio to find the aggregate volume and weight needed.
Your result
0.882
Aggregate volume
Aggregate weight1,323
AI explanation
Formula
Dry volume = wet volume × (1 + wastage%) × 1.54; aggregate volume = dry volume × (aggregate parts ÷ total parts)Worked example
1 m³ of M20 concrete, 5% wastage
| Field | Value |
|---|---|
| Wet concrete volume (m³) | 1 |
| Concrete mix | M20 (1:1.5:3) |
| Wastage allowance (%) | 5 |
| Aggregate volume | 0.882 |
| Aggregate weight | 1323 |
Assumptions
- Aggregate density assumed at 1500 kg/m³ (typical loose bulk density for crushed stone aggregate — actual density varies by source and gradation).
- Dry volume = wet volume × 1.54, the standard site-estimation factor.
Frequently asked questions
What counts as "aggregate" in this calculator?
Coarse aggregate — crushed stone or gravel — the largest-particle-size ingredient in concrete, distinct from fine aggregate (sand).
Why does a richer mix need less aggregate proportionally?
A richer mix (like M25) has a smaller aggregate-to-cement ratio than a leaner mix (like M15), so more of the dry volume goes to cement and less to aggregate.
I need cement and sand quantities too — is there one calculator for all three?
Yes — the Concrete Calculator (and the Slab/Footing/Column Calculators) show all three quantities together from the same inputs.